Walter gillespie



W. GILLBSPIE. Furnace-Grate.

No. 225,590. Patentedma. 16, 1880.

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N PETERS. PHDTD-LTTHOGHAFHER WASHINGTON D C UNITED STATES PATENT OFFICE.

WALTER GILLESPIE, OF MOTREAL, QUEBEC, CANADA, ASSIGNOR TO GEORGE A. DRUMMOND, OF SAME PLACE.

FU RNACE-GRATE.

SPECIIICATION forming 'part of Letters Patent No. 225,590, dated March 16, 1880.

Application filed January 24, 1880.

To all whom it may concern Be it known that I, WALTER GILLEsPrE, of the city of Montreal, in the District of Montreal, and Province of `Quebec, Canada, have invented certain new and useful Improvements in FurnaceGrates; and I do hereby declare that the following is afull, clear, and exact description of the same.

My invention, which is specially applicable to the boilers of marine and stationary engines, has for its objects to keep the re clean and level, to facilitate stoking, and to evolve the greatest amount of heat from the combustion of a given quantity of coal.

It may be described, brieiiy, as consisting in making the bars of a spiral shape and rotating them continuously half in either direction outward from the center, so as to insure a constant movementof the burning coal toward the bridge.

For full comprehension, however, of my invention, reference must be had to the annexed drawings, forming part of this specification, in which- Figure l is a plan view of a furnacegrate embodying my invention, and Eig. 2 a front view of same.

Similar letters of reference indicate like parts.

A is the front, and A the bridge of the-furnace or iirefchamber, which may be of any construction found suitable. B B B' B are the bars, of any diameter desired and set any suitable distance apart, and having, as shown in Fig. l, their whole length which is in contact with the fuel of a spiral form, (the part under the dead-plate being, by preference, straight,) and so arranged that the spirals of 011e half the bars-z'. c., those marked B--shall be opposite to the spirals of the other half, (marked B,) or, in other words, these bars be set right and left.

rIhe ends of the bars are carried through the front of the furnace, and on them arennounted worm-gear wheels C C C' C', intermeshing with and receiving motion, respectively, from corresponding worm-wheels D D D D', secured on a shaft, E, running the whole length of the furnace or furnaces and rotated from any goingpart of the engine or machinery by means of a belt-and-pulley gearing, or in any other Way.

The worm-wheels D D D Dl are so arranged as to turn the Worm-gears C C C C', and with them the bars B B B' B', respectively, in opposite directions, each set turning away from the center, as shown in Fig. 2.

The shaft E, with its Worm-wheels, and the worm-gears G C C C are suitably inclosed.4

The bars are, by preference, made hollow, and any suitable means may be used for passing water through them, such, for instance, as a continuous feed-pipe with branches to each bar, the bridge in such a case being holloW and provided with any suitable discharge 5 and all parts of the .furnace other than the bars and the features just described form no part of the invention and can be built in any Way.

The operation of my invention will be so clearly understood from the foregoing and the drawings that it is only necessary to say that the continuous rotation of the shaft at the in each direction outwardly from the longii tudinal axis of the furnace, and that this double movement of the spirally-shaped bars will carry the fuel from the center of the front of the furnace, where it is put in gradually and continuously backward to the bridge, at the same time spreading it out on either side.

By this means I obtain an even fire, which can be easily stoked, as it will hardly require raking, and the constant revolution of the bars entirely obviates any choking or diiiiculty from clinkers. In addition to this a very large proportion of the gases is consumed and utilized, and a corresponding amount of heat evolved.

`Although, as before mentioned, my invention is specially adapted to the boilers of marine and stationary engines, it may be used for all classes of furnaces for raising steam, and supplementary mechanism be provided for rotating the continuous shaft where the means do not exist or are not applicable.

lam aware that revolving bars have previously been used, and therefore do not claim such broadly. y

What I claim is as follows:

In a furnace-grate,spira1 bars revolving' Worm-Whee1s mounted on a continuous revolviu opposite directions outward from the lougiing shaft, 21,11 substantially as herein shown tudinal axis of the furnace,substzamtially as set and described.

forth, and for the purposes described. WALTER GILLESPIE. 5 2. The furnace-bars B B B' B', revolving in Vituesses:

opposite directions, and carrying o their ends FRAS. HY. REYNOLDS,

Worm-gears intermeshing with and rotated by R. ARTHUR KELLOND. 

